[refurb] Check for subclasses includes subscript expressions (FURB189) (#16155)

## Summary

Added checks for subscript expressions on builtin classes as in FURB189.
The object is changed to use the collections objects and the types from
the subscript are kept.

Resolves #16130 

> Note: Added some comments in the code explaining why
## Test Plan


- Added a subscript dict and list class to the test file.
- Tested locally to check that the symbols are changed and the types are
kept.
- No modifications changed on optional `str` values.

crates/ruff_linter/resources/test/fixtures/refurb/FURB189.py

@@ -8,7 +8,7 @@ class SetOnceMappingMixin:
         if key in self:
             raise KeyError(str(key) + ' already set')
         return super().__setitem__(key, value)
-    
+
 
 class CaseInsensitiveEnumMeta(EnumMeta):
     pass
@@ -23,6 +23,12 @@ class L(list):
 class S(str):
     pass
 
+class SubscriptDict(dict[str, str]):
+    pass
+
+class SubscriptList(list[str]):
+    pass
+
 # currently not detected
 class SetOnceDict(SetOnceMappingMixin, dict):
     pass